#site_header {
  position: fixed;
  z-index: 1000;
}

a {
  text-decoration: none;
}

.side_nav {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 1000;
  width: 110px;
  background: none;
  cursor: pointer;
}
.side_nav:before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 1px;
  height: 32px;
  background-color: #ccc;
}
.side_nav .side_text {
  position: absolute;
  width: 100%;
  top: 50%;
  transform: translateY(-50%);
  left: 0;
  z-index: 999;
  font-size: 11px;
  line-height: 14px;
  color: #333;
  opacity: 0.5;
}
.side_nav .side_text .txt {
  width: 10px;
  line-height: 20px;
}
.side_nav .side_logo {
  position: absolute;
  width: 100%;
  bottom: 50px;
  left: 0;
  z-index: 999;
}
.side_nav .side_logo img {
  width: 50%;
  opacity: 0.2;
}
.side_nav .m-sideNav__btClose {
  position: absolute;
  overflow: hidden;
  background: url(../static/menu/close.svg) no-repeat center;
  -moz-background-size: contain;
  background-size: contain;
  text-indent: -9999px;
  top: 36px;
  left: 36px;
  width: 39px;
  height: 38px;
}
.side_nav .m-sideNav__menu {
  position: absolute;
  top: 36px;
  right: 36px;
  left: 36px;
}
.side_nav .m-sideNav__menu .m-sideNav__menuLine {
  border-bottom-color: rgba(255, 255, 255, 0.4);
  background-color: #fff;
  height: 1px;
  margin-bottom: 14px;
  border-bottom: 1px solid #fff;
}
.side_nav .m-sideNav__menu.dark .m-sideNav__menuLine {
  background-color: black;
}
.side_nav:hover {
  background: #e6e6e6;
}
.side_nav:hover .m-sideNav__menu .m-sideNav__menuLine {
  border-bottom-color: rgba(0, 0, 0, 0.4);
  background-color: #000;
  border-bottom: 1px solid #000;
}

.index_header .menu_list a:nth-child(1) .txt {
  color: #ccc !important;
}

.about_header .menu_list a:nth-child(2) .txt {
  color: #ccc !important;
}

.shenghuohui_header .menu_list a:nth-child(3) .txt {
  color: #ccc !important;
}

.news_header .menu_list a:nth-child(4) .txt {
  color: #ccc !important;
}

.contact_header .menu_list a:nth-child(5) .txt {
  color: #ccc !important;
}

.index_top_menu .item:nth-child(1) {
  color: #bfbfbf;
}

.about_top_menu .item:nth-child(2) {
  color: #bfbfbf;
}

.shenghuohui_top_menu .item:nth-child(3) {
  color: #bfbfbf;
}

.news_top_menu .item:nth-child(4) {
  color: #bfbfbf;
}

.contact_top_menu .item:nth-child(5) {
  color: #bfbfbf;
}

.side_box {
  position: fixed;
  width: 100vw;
  height: 100vh;
  background: #fff;
}
.side_box .side_content {
  width: 840px;
  left: 0;
  right: 0;
  margin: 0 auto;
  position: absolute;
  padding-top: 222px;
  padding-top: 50px;
}
.side_box .side_content .head {
  justify-content: space-between;
  height: 50px;
}
.side_box .side_content .head .title_box {
  flex-shrink: 0;
}
.side_box .side_content .head .title_box .title {
  border-bottom: 1px solid #333;
}
.side_box .side_content .head .title_box .title span {
  font-size: 20px;
  font-family: Source Han Serif CN;
  color: #333333;
  line-height: 30px;
}
.side_box .side_content .head .logo .img {
  width: 133px;
  height: 32px;
}
.side_box .side_content .menu_list {
  margin-top: 112px;
}
.side_box .side_content .menu_list .item {
  flex-shrink: 0;
}
.side_box .side_content .menu_list .item .icon {
  line-height: 0;
  margin-right: 18px;
  width: 17px;
  height: 17px;
}
.side_box .side_content .menu_list .item .txt {
  white-space: nowrap;
  line-height: 50px;
  font-size: 18px;
  font-family: Source Han Sans CN;
  color: #333333;
}
.side_box .side_content .menu_list a {
  text-decoration: none;
}
.side_box .side_content .menu_list a:hover .txt {
  color: #ccc;
}
.side_box .side_content .menu_list .active .txt {
  color: #ccc !important;
}
.side_box .side_content .lang {
  margin-top: 142px;
  margin-top: 80px;
}
.side_box .side_content .lang .lang_item {
  flex-shrink: 0;
  font-size: 13px;
  font-family: Source Han Sans CN;
  color: #333333;
}
.side_box .side_content .lang .splice {
  padding: 0 10px;
}

@media screen and (max-width: 959px) {
  .side_nav {
    width: 61px;
  }
  .side_nav .side_logo {
    bottom: 18px;
  }
  .side_nav .m-sideNav__menu {
    top: 18px;
    right: 18px;
    left: 18px;
  }
  .side_nav .m-sideNav__menu .m-sideNav__menuLine {
    height: 1;
    margin-bottom: 9px;
    border-bottom: 1px solid #fff;
  }
  .side_nav .m-sideNav__btClose {
    top: 18px;
    left: 18px;
    width: 25px;
    height: 24px;
  }
  .side_nav:hover {
    background: none;
  }

  .side_content {
    width: 100vw !important;
    padding-left: 79px;
    padding-right: 18px;
    box-sizing: border-box;
  }

  .side_box .side_content {
    padding-top: 100px;
  }
  .side_box .side_content .lang {
    margin-top: 50px;
  }

  .menuIsActive .side_nav {
    background: #e6e6e6;
  }
}
@media screen and (min-width: 960px) and (max-width: 1279px) {
  .side_content {
    width: 680px !important;
  }
}